The thick filaments are connected in the middle of the sarcomere by which structure?

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Study for the Ivy Tech APHY 101 Muscle System Test. Dive into comprehensive questions with clear hints and explanations, boosting your confidence for the exam!

Multiple Choice

The thick filaments are connected in the middle of the sarcomere by which structure?

Explanation:
In the center of each sarcomere, thick myofilaments are held together by the M line. This central protein lattice anchors and aligns adjacent thick filaments, keeping the myosin bundles in register so they can pull on the actin filaments smoothly during contraction. The Z discs mark the sarcomere boundaries and anchor thin filaments; the A band covers the length of the thick filaments plus the overlap with thin filaments; the I band contains only thin filaments and is bisected by a Z disc. So the structure that connects thick filaments in the middle is the M line.

In the center of each sarcomere, thick myofilaments are held together by the M line. This central protein lattice anchors and aligns adjacent thick filaments, keeping the myosin bundles in register so they can pull on the actin filaments smoothly during contraction. The Z discs mark the sarcomere boundaries and anchor thin filaments; the A band covers the length of the thick filaments plus the overlap with thin filaments; the I band contains only thin filaments and is bisected by a Z disc. So the structure that connects thick filaments in the middle is the M line.

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